Transformer



Jan. 22, 1935. A. HELGASON 1,988,733

TRANSFORMER Filed May 28, 1934 INVENTOR.

'Rm HELcAsoN TTOY-NEY Patented J an. 22, 1935 UNITED STATES PATENT OFFICE 1,988,733. TRANSFORMER Ami Helgason, Wilmette, IlL, assignor to Chicago Transformer Corporation. Chicago, 111., a corporation of Illinois Application May 28, 1934, Serial No. 727,842

'1 Claims. (Cl. 175-361) This invention relates to transformers and closing a plurality of windings. The transformparticularly to small transformers having all the er is mounted upon a suitable base 5. The leads thereof coming out of one end. Transtransformer laminations are clamped together formers of this type, such as, for example, power and the entire transformer structure is supsupply transformers for radio receivers are usuported on base 5 by means of bolts and nuts 5 ally mounted vertically on a chassis pan. A 11. The windings ofthe transformer have a suitable aperture is stamped out of the pan and plurality of leads 12 to 20 inclusive, for outside a portion of the transformer including the wirconnection, projecting through suitable apering leads extends below the top of the chassis tures in the bottom of bell 2.

10 pan and into the interior thereof. The trans- As shown in Figure 3 the transformer windings 10 former is bolted in this fashion and usually comprise a primary 25 and a secondary 25'. presents a clean exterior unbroken by any wir- Primary 25 has p lity of taps 26 to 29 inelusive, and also, end connections 12 and 30.

In the case of radio receiversand, in fact, in These wires 26 to 30 inclusive are all taken out any electrical device employing transformersthrough the top end of the transformer throu h 15 the occasion frequently arises when the transbell 1. Supported by bell 1 and in spaced relaformer ratio must be varied. While 110 volts, tion thereto is an insulating pan 31 of bakelite 60 cycles is the usual standard in this country, or similar material, having a plurality of bindthere are numerous and varied voltages in other in Posts 36 to 40 inclusive T0 each p l d parts of the world. In a case of this character, 6 to 30 inc usive, are respectively c nnected. 0 particularly where it is desired to export radio A connector lead 13 from the bottom end of the receivers or other articles employing a transtransformer is carried through the transformer former, it is desirable from a production stando the op thereof and terminates in a connectpoint to employ a universal type of transformer ing u e entire y be P c d which may be mounted in the apparatus and y a metal Cover 45 maintained in Place y y 25 connected in the usual manner. In the event Well known means. that the transformer ratio must be changed to It iS evident that the various leads 12 to 20 intake care of different voltages, it is desirable that elusive the transformer P j t be w base some simple method be available for accomplish- 5 may be pe ly wired to utilization ciring the above, In orde t a id s i e difiicuits on the production line in the customary 30 culties, and in order to make it possible for a mannere eafte in the event that any parlay-man to accomplish this, it is necessary that tieulal' Voltage is desired such as, for p this method be simple and fool-proof. Furtherthe Voltages shown adjacent the b d Posts more, it is necessary that this method be eco- 36 i0 40 inclusive, the corresponding uts O nomical. In addition, it is desirable that the th s indin posts ay b s n d and lu 35 change be effected from the exterior of the aper- 41 of d 13 y e connected o y d si ed ture rather than from any interior, portion p It is Obvious that this connection m y e thereof. In the case of a radio receiver, the made by y unskilled person in an e ceed y maze of wiring in the chassis pan is such as to short time and does not require y 00 01' preclude the possibility of a fool-proof and efelaborate equipment. It is also obvious that the 40 fective change. Furthermore, by making it posec da y W di ay be Operated upon in this sible to make the change from the exterior of ner rat e t n the p ma y or even both the apparatus, it is evident that just prior to windin All leads for connection to an exterfinal checking, when. the radio receivers or other 119-1 C cu t are led out on one side of the trans- 45 devices are stacked, a person can simply go over former and all leads including at least e jump- 45 the various units and make the necessary er from the external circuit leads are brought changes without turning over of any of the u its, out from a different side of the transformer for Referring to the drawing, Figure 1 is an ilinternal circuit connection. lustration of a transformer employing this in- What is claimed is:

vention. Figure 2 is a plan view looking down 1. A transformer comprising laminations and 50 upon this same transformer. Figure 3 is a windings each winding having at least two tercircuit diagram of the transformer. minal leads and at least one winding having a Referring to the drawing, a pair of pressed plurality of intermediate tap leads, said tap steel end shields or bells 1 and 2 are shown. leads and one terminal lead of the correspond- Between these is a stack of laminations 3 ening winding out of said transformer being 55 brought out on one side thereof. said leads being provided with binding terminals, the remaining leads of said transformer being brought out from another side thereof, said other leads being adapted to be permanently connected to external circuits. and a connector lead going through said transformer from one side to the other and having one end for ready connection with any one of said binding terminals and the other end with said remaining leads for permanent connection with an external circuit.

2. A transformer comprising a stack of laminations, a plurality of windings having terminal leads and at least one winding having a plurality of tap leads, end plates for said transformer, said tap leads and one of the terminal leads passing through one of said end plates for internal circuit connection, the remaining leads passing through the other end plate for external circuit connection, said transformer being adapted to be mounted on a base with the end plate and external circuit leads extending below: said base plate and a connector lead extending through the transformer from one end plate through the other and having ends extending therethrough, said connector lead being adapted to be connected to any one of said internal circuit group of leads for altering the transformer ratio.

3. The structure of claim 2 wherein the internal circuit leads are brought up to a terminal board whereby the corresponding connector lead end may be readily connected to any desired lead.

4. A transformer comprising a stack of laminations, a plurality of windings in transformer relationship therewith and including at least one primary and secondaryfterminal leads for said primary and secondary windings. intermediate tap leads for at least one of said windings, said one winding having one terminal lead and all'tap leads extending in one direction from one side of said transformer, said other winding having all its connections extending in another direction from another side of said transformer, the remaining terminal lead of said one windingalsoextending.

from the same direction and transformer side as the connections from the other winding, said transformer being adapted to be mounted in such afashionastomakeaccesstosaidotherside of said transformer and the connections coming out therefrom dimcult while said one side of said transformer and the leads coming therefrom are readily accessible, anda connector lead passing through said transformer structure having one end extending from said one direction from said one side of said transformer and its other end extending from said other directionand side of said transformer, whereby said first end of said connector may be readily connected to any desired tap lead to alter the transformer ratio without moving the transformer from its mounting.

5. The transformer of claim 4 wherein all the leads coming from said other side of said transformer are adapted to be permanently connected in suitable circuits while the leads coming from said one side of said transformerare provided with means for making detachable connections.

6. The transformer of claim 4 wherein all the leads coming from said other side of said transleads coming from said other side of said transformer are adapted to be permanently connected in suitable circuits and a terminal board is carried by said transformer on its one side to which is connected the one terminal and tap leads extending from said one side of said transformer while said connector lead is adapted to be readily connected to any desired terminal of said board to alter the transformer ratio.

' ARNI HELGASON. 

